Drill.



cripta RHAt WEATHESBY, OFOUSTON, TEXAS.

priant.

ihlltddd.

Application med August 30,

To all whom it may concern:

Be it known that l, Flinn llt. lWns'ri-rnnsnir, a. citizen of the United States, and a resident of Houston, in the county .of Harris and iltate of' rlexas, have made certain new and useful lnlprovenients in Drills, of which the following is a speeiiication. l

lily invention relates to drills, vand more particularly to drills of the. kind employed for earth boring, iny more particular pui pose being,` to provide a comparatively simple drill, made preferably. in e. single piece, and havingprovision for aoefinplilhing a number oi distinct purposes.

,More particularly stated l' seek to provide a drill which may be mounted upon drill pipes of different diameters, and which 'oarries a cutting blade so formed as to guide the drill accurately even When the drill enn counters surfaces of 'varying degrees oi' hardness, and especially under conditions Where drills ofv ordinary form Would moet likely be diverted from their proper paths of travel in descending yinto the earth.'

Reference is made tothe accompanying drawing forming part of this speoiiication and in which like letters indicate like parts.

Figui-e1 is a front elevation of iny improved drill, Fig. 2 is a side elevation oit the same, and lig. 3 a plan view of the drill.

A massive stern l having approximately a cylindrical form isy provided with a thread 5 upon thefsuritaoe oi the stein where the stein is of largediaineter, as will be understood from Fig. 1. .'llhe stein is provided with a substantially cylindrical portion (i of snialler diameter, this portion having a thread 7. The stein is further provided with holes S extending through it in the general longitudinal direction `of its longest axis, which is also its axis of rotation, While in action.' A blade l0 is integral with the stein d and is provided with two cutting edges 11, 12, these Vedges terminating,` in points 13, 14 and meetingI at a point 15. That 4is to say the edges 1l, 12 meet to forni' a crotch 'at the point 15, as may be understood from Fig. l. The lower ends ot' 1 the holes 8, 9 vare shown :1t-9H' and are upon opposite sides of the bladelO. V' 'lhe drill may be cast, forged, pressed, or otherwise formed into shape, and inay be made oi.E any suitable inaterial, though l preferablyeinployusteel orthe purpose.; The stern of the drill, as will be underf l stood from the foregoing deseription, has

aineter, such pipes being {provided inten i nelly lat their lower ends Witih threads for facilitating the fitting of the drill to be carried. l. f

My improved drill above described is adapted to be inouiited upon a pipe oisrnall diametersay four inches internal diameter, by fitting the thread l into such pipe, or to be fitted upon a six inch by use ol the thread 5. y

rlhe stein is further provided with a shoul der 16 which serves as a imiting stop for preventing the drill stein froin'extending too arinto the pipe and serves also as an abutment for receiving lthe pressure of the pipe when fitted upon the smaller diameter of the stein.

The operation. of myA device is as follows:

The operator deteri'nines `Whether he Willuse the drill in connection with a sin-all pipe or vwith a large pipe. lf the-'small pipe to be used the portion of jsmall diameter oi'this stein is inserted into the pipe and secured thereto by aid ol the thread 'l'. lil the pipe of larger diameter is employed the thread 5 is used as above stated. Water is supplied through the holes 8, 9,), ina inanner'well understood in this art .vv The pipe being located the drill is caused'to turn and the cutting,` edges 11, 19 are .brought to play upon the earth and rock to be drilled. Suppose now that the drill, in descending` into the earth,

encounters a round hard substance such as a stone; suppose further that the stone 1s not located centrally beneath the drill, but is. n

llittle to one side of the center of the axialA line thereof. ln this event the points 13, 1st pass successively into engagement with thestone, iirst cutting;v a shallow groove oi arcuate form and then gradually removing successive portions of the rook. rlhe Iirst of the points 13, le to engage the rock, by scoring the rock makes a guideovay `in which the other point can readily follow, so that there portion 6 of lill@ 'is little or no tendency for thedrill to be pushed sdewise or in any other manner displaced, by the pressure of the sione.

With drills of ordinary ccnsebrucicn, es scon 'as one of the cutting edges 'cr emmers of the drill encounters a stone or rock, and especially ili'the latter be hard, smeet'h, and somewhat rnndcd, ihene is a greci, tendency .12er-she drilla by its reaction upon che sion-e or reels, to he forced to one side and dis placed relative@y to its axis of relation. My drill avoids vthis, because owing to the nclinetion of the edges l, l2, the pcinis 13, 'lA/l serve in n ,sense as anchornges for preventing the 'drill from being displaced. In other W0rds,vtl1e drill has approximately as much tendency to be drawn outwardly to 'wurd the rock as-i has t be forced inwardly by the rock.

l do not liinit myself to the precise `con ssruction shown as variations may be mnd@ therefrom without departing from .the SPL-.is

ci' I ny invention. l

n By flaring 4two` ccnnections for vdireremt sized pipes, if the drlll p1pe happens to twist all, one ci' the threaded portions 5 or win enable another drill pipe to be secured te che drill in order in liilz it ont of the drill hole.

l claim:

The herein described drill comprising :L substantially cylim l stel..- und :i flat blade integral wiili siem, the lower portion cf the sm et.. ldingj below the upper edge of the l ne sind being tapered downwardly and rounded,l said blade being' provided with oppesitely facing cutting edges, inclining dcn'n'wfmlly from he central p0ri-Jn the ends ci lie, blade, said stein being provided willi s pair of bores arranged in a plane lying in @renfe angular relai' L with the blade sin? cpc poini'is in the rounded und is d pci-cion of the stem Jl. above and interi edinc the ends of che sul ting edges and below the upper edge of the blade.

l Flilll) Bled-HARDWEATHERSBY.

Witnesses J'. D. LONG Vil. T. Form., 

